of, pertaining to, resulting from, or using atoms, atomic energy, or atomic bombs: an atomic explosion.
propelled or driven by atomic energy: an atomic submarine.
Chemistry. existing as free, uncombined atoms.
extremely minute.
Also, atomical.

1670–80; atom + -ic

atomically, adverb
nonatomic, adjective
nonatomical, adjective
nonatomically, adverb Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
atomic (əˈtɒmɪk)
1.  of, using, or characterized by atomic bombs or atomic energy: atomic warfare
2.  of, related to, or comprising atoms: atomic hydrogen
3.  extremely small; minute
4.  logic (of a sentence, formula, etc) having no internal structure at the appropriate level of analysis. In predicate calculus, Fa is an atomic sentence and Fx an atomic predicate

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

1670s as a philosophical term (see atomistic); scientific sense dates from 1811, from atom. Atomic number is from 1821; atomic mass is from 1898. Atomic energy first recorded 1906; atomic bomb first recorded 1914 in writings of H.G. Wells, who
thought of it as a bomb "that would continue to explode indefinitely."
"When you can drop just one atomic bomb and wipe out Paris or Berlin, war will have become monstrous and impossible." [S. Strunsky, "Yale Review," January 1917]
Atomic Age is from 1945.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
atomic   (ə-tŏm'ĭk)  Pronunciation Key 
  1. Relating to an atom or to atoms.

  2. Employing nuclear energy.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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